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Capability of Quasar Selection by Combining SCUSS and SDSS Observations
- Source :
- Publications of the Astronomical Society of the Pacific; February 2015, Vol. 127 Issue: 948 p94-101, 8p
- Publication Year :
- 2015
-
Abstract
- The South Galactic Cap u-band Sky Survey (SCUSS) provides a deep u-band imaging of about 5000 deg2in south Galactic cap. It is about 1.5 mag deeper than the SDSS u-band. In this article, we evaluate the capability of quasar selection using both SCUSS and SDSS data, based on considerations of the deep SCUSS u-band imaging and two-epoch u-band variability. We find that the combination of the SCUSS u-band and the SDSS griz-band allows us to select more faint quasars and more quasars at redshift around 2.2 than the selection that uses only the SDSS ugrizdata. Quasars have significant u-band variabilities. The fraction of quasars with large two-epoch variability is much higher than that of stars. The selection by variability can select both low-redshift quasars with ultraviolet excess and mid-redshift (2 < z< 3.5) quasars where quasar selection by optical colors is inefficient. The above two selections are complementary and make full use of the SCUSS u-band advantages.
Details
- Language :
- English
- ISSN :
- 00046280 and 15383873
- Volume :
- 127
- Issue :
- 948
- Database :
- Supplemental Index
- Journal :
- Publications of the Astronomical Society of the Pacific
- Publication Type :
- Periodical
- Accession number :
- ejs56699552
- Full Text :
- https://doi.org/10.1086/680212